EP1096818A1 - Basisstation mit einer ersten und zweiten Basiseinheit - Google Patents

Basisstation mit einer ersten und zweiten Basiseinheit Download PDF

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Publication number
EP1096818A1
EP1096818A1 EP99121607A EP99121607A EP1096818A1 EP 1096818 A1 EP1096818 A1 EP 1096818A1 EP 99121607 A EP99121607 A EP 99121607A EP 99121607 A EP99121607 A EP 99121607A EP 1096818 A1 EP1096818 A1 EP 1096818A1
Authority
EP
European Patent Office
Prior art keywords
base unit
signals
combiner
base station
base
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP99121607A
Other languages
English (en)
French (fr)
Inventor
Michael Jeck
Harald Keller
Thomas Unshelm
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Priority to EP99121607A priority Critical patent/EP1096818A1/de
Priority to CNB00815063XA priority patent/CN1169388C/zh
Priority to PCT/EP2000/010289 priority patent/WO2001033876A1/en
Priority to EP00972807A priority patent/EP1243147B1/de
Priority to AU11407/01A priority patent/AU1140701A/en
Priority to AT00972807T priority patent/ATE279080T1/de
Priority to JP2001534898A priority patent/JP2003513569A/ja
Priority to DE60014705T priority patent/DE60014705T2/de
Publication of EP1096818A1 publication Critical patent/EP1096818A1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • H04W88/085—Access point devices with remote components
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity

Definitions

  • the present invention relates to a base station with a first and a second base unit. Particularly the invention relates to a base station, wherein each base unit comprises
  • a base station transmitting and receiving signals of defined standard taken from a group, comprising e.g. GSM900, GSM1800, GSM1900, PDC, ETACS.
  • GSM900, GSM1800, GSM1900, PDC, ETACS e.g. GSM900, GSM1800, GSM1900, PDC, ETACS.
  • the patent document EP0566603B discloses a base station system with base stations for different types of mobile telephone systems like TACS, ETACS or GSM using existing antennas and antenna cables on a base station site for providing additional services to the subscribers.
  • the disadvantage here is that additional filter means are necessary to lead the signals of all transmitters to one transmitter antenna.
  • the resulting sharing of one antenna by several transmitted signals of different type has disadvantages like for example intermodulation or reduction in power. Also it is impossible to combine signals of different standard using different modulation techniques but with the same frequency range or overlapping frequency ranges.
  • Fig.4 shows a typical state of the art base station specified in GSM900 with a base unit 100 for transmitting and receiving signals via an antenna system 110.
  • a transmitter part 120 several transmitters Tx11-Tx1N processing signals for transmission via a combiner 121 and a diplexer DPX1 to an antenna 111.
  • the same antenna can be used to receive signals, passing the diplexer DPX1 only in direction to the receiver part 130 via an amplifier LNA11 and processed in the receiver part 130.
  • Signals received by a second antenna 112 and transferred to a second receiver part 150 via a filter element BP1 and an amplifier LNA12 are also processed in that second receiver part 150 in such a way that together with the received signal by the first receiver part 130 both signals can be used for increasing the quality of receiving signals by a so called diversity reception.
  • GSM900 for example is specified with two frequency bands for transmitting and receiving close to 900 MHz and using a Gaussian-Minimum-Shift-Keying (GMSK) modulation.
  • the available frequencies in both frequency bands are allocated to different base stations, each covering an defined area within a cellular network.
  • the number of frequencies allocated to each base station define the available traffic capacity for voice channels of the cell.
  • the maximum number of transmitters Txl11-Tx1N in the transmitter part 120 of the base station depends on the allocated frequencies within the area covered. If it is necessary to increase the traffic capacity to serve more users within the covered area additional transmitters are required . An easy way is to add a further base station to the existing one to cover the same area.
  • a combination of two base units one transceiving signals specified in GSM900 and the other on transceives in GSM1800 in or a combination of GSM1800 and UMTS can be used.
  • the advantages are that the number of voice channels can be increased, because of use of frequencies from frequency bands from a different standard.
  • An additional base unit normally has its own antenna system which is added to the base station site. To avoid the necessity to add additional antenna systems on the base station site and limit the number of antennas, the existing antennas are used by both base units.
  • the first base unit 100 is used for example supporting GSM900 whereas the second base unit 200 supporting GSM1800 functionality. Both base units are connected in such a way that the number of antennas is not increased.
  • the transmitter part 120 of the first base unit 100 comprises several transmitters Tx11-Tx1N for the used frequencies within the GSM900 system.
  • the signals of each transmitter are combined by a combiner 121 and then transferred via a diplexer DPX1 to the antenna 111.
  • a filter combiner is used as combiner element 121 to achieve high traffic capacity.
  • the transmitter part 220 of the second base unit 200 comprises several transmitters Tx21-Tx2N for the frequencies used within the GSM1800 system.
  • the signals of each transmitter are combined by a combiner 221 and then transferred via a diplexer DPX2 to the antenna 112.
  • a filter combiner is possible but a hybrid combiner is used advantageously as combiner element 221, enabling full frequency hopping capability. In this way better transmission quality and better frequency reuse in a mobile communication network can be provided while keeping the same number of antennas.
  • the first receiver part 130 of the first base unit 100 receives signals from the antenna 111 via the diplexer DPX1 and an amplifier LNA1.
  • a splitter 140 is inserted in the signal path between the antenna 111 and the first receiver part 130 to extract signals of the second specification received by the antenna 111. This extracted signal is used for diversity reception of the second base unit 200.
  • splitter 240 is disposed between the antenna 112 and the first receiver part 230 to extract signals of the first specification received by the antenna 112.
  • the extracted signals pass filter element BP1,BP2 and additional amplifiers LNA12,LNA22.
  • An adjusting element A1,A2 is inserted to adjust the extracted signals for further processing by the respective receiver parts. This adjustment can be performed for the gain and/or frequency and /or phase of the extracted signals. With such an arrangement several advantages are achieved. Voice channel traffic capacity is increased, the number of antennas is the same as before upgrading the first base unit 100 by a second base unit 200 and also the diversity reception is preserved.
  • Fig.3 shows an arrangement which has been upgraded from an existing GSM900 base unit 100 with a second base station of GSM1800 functionality with minimum hardware effort.
  • the upgrade has been performed by disconnecting one antenna 112 from the first base unit 100 and connecting it to the second base unit 200,inserting splitters 140 and 240 in the receiving branch of each base unit, and adding two additional cables to connect the splitters with the corresponding receiver parts 150 and 250.
  • the antennas 111 and 112 must be suitable for transmitting signals of at least the specification of the corresponding base unit and receiving signals of both specifications. Else the antennas have to be replaced by suitable ones, but nevertheless the number of antennas is not increased.
  • Such an arrangement, as shown in Fig.3, to achieve high voice channel traffic capacity can be for example combinations of base units as described above as well as combinations of GSM900 and GSM450, or GSM and IS136, or GSM and NMT, or GSM and UMTS or GSM and EDGE combinations.
  • GSM and UMTS are specified to support high data rates in comparison to GSM systems, which are developed mainly for supporting voice channel traffic. That means that the embodiments described are capable of simultaneous support of voice channel traffic and high data rate in an area.
  • the preferred embodiment, shown in Fig.3, can easily be used for a combination of a GSM900 and a UMTS system for supporting simultaneous voice channel traffic and high data rates.
  • the splitter 140,240 has to be inserted before the diplexer DPX1, DPX2, if the diplexer is not able to support frequencies from both specifications.
  • the splitter 140 has to be inserted between the antenna and the diplexer DPX1 because a diplexer and an amplifier generally have a limited frequency range.
  • FIG.2a A second embodiment of the present invention is shown in Fig.2a.
  • the first base unit 100 is a GSM900 system
  • the second base unit 200 is an EDGE system of the same frequency band.
  • the difference between Fig.2a and Fig. 3 is that the splitter 140,240 is arranged in such a way, that it extracts the diversity signal directly before the first receiving part 130,230 of the base unit 100,200. This is possible because both base units for supporting GSM900 and EDGE functionality use the same frequency band, and the existing elements within the receiving path can be reused.
  • the first base unit 100 is a GSM900 system and has a filter combiner as combiner element 121 which allows high capacity per transmitting antenna 111 by low loss combination of the signals from the transmitters Tx11 - Tx1N.
  • the second base unit 200 is an EDGE system and uses as combiner element 212 a hybrid combiner which allows full frequency hopping capability for signals transmitted over antenna 112 because of low signal distortion for higher modulation techniques like 8PSK or 16QAM.
  • the main advantage of the combination of a base unit 100 specified for GSM900 and a second base unit 200 specified for EDGE system is that the second base unit can support high data rate and/or voice channel capacity.
  • the combiner 221 is a well known hybrid combiner.
  • a hybrid combiner integrated in the base unit which supports the EDGE specification has the advantages that the distortion of the signals is low in comparison to a filter combiner, allowing higher data rates for given path attenuation between the transmitting base unit and an user.
  • the base unit for EDGE preferably allows to switch between two modulation modes, one supporting GMSK for voice channel traffic and the second supporting 8PSK mode for higher data rate traffic.
  • the combination of base units specified for GSM900 and EDGE can at one time increase the voice channel capacity if the EDGE base unit is in the GMSK modulation mode and can at a second time support simultaneously voice channel traffic and high data rate if the EDGE base unit is in the 8PSK modulation mode.
  • Fig. 2b shows the area covered by a combination of a first base unit specified for GSM900 and a second base unit specified for EDGE as described with respect to Fig.2a.
  • an inner area 1' simultaneous high data rate and high voice channel traffic is supported if the second base unit 200 is in the 8PSK modulation mode.
  • the extensive area 1 outside of the area 1' can be covered by the second base unit only with a GMSK modulation.
  • data traffic and voice channel traffic services equal to the first base unit 100 specified for GSM can be achieved by the second base unit 200 specified for EDGE.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Transmission System (AREA)
EP99121607A 1999-10-29 1999-10-29 Basisstation mit einer ersten und zweiten Basiseinheit Withdrawn EP1096818A1 (de)

Priority Applications (8)

Application Number Priority Date Filing Date Title
EP99121607A EP1096818A1 (de) 1999-10-29 1999-10-29 Basisstation mit einer ersten und zweiten Basiseinheit
CNB00815063XA CN1169388C (zh) 1999-10-29 2000-10-19 带有第一和第二基本单元的基站
PCT/EP2000/010289 WO2001033876A1 (en) 1999-10-29 2000-10-19 Base station with a first and a second base unit
EP00972807A EP1243147B1 (de) 1999-10-29 2000-10-19 Basisstation mit einer ersten und zweiten basiseinheit
AU11407/01A AU1140701A (en) 1999-10-29 2000-10-19 Base station with a first and a second base unit
AT00972807T ATE279080T1 (de) 1999-10-29 2000-10-19 Basisstation mit einer ersten und zweiten basiseinheit
JP2001534898A JP2003513569A (ja) 1999-10-29 2000-10-19 第１及び第２基地ユニットを有する基地局
DE60014705T DE60014705T2 (de) 1999-10-29 2000-10-19 Basisstation mit einer ersten und zweiten basiseinheit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP99121607A EP1096818A1 (de) 1999-10-29 1999-10-29 Basisstation mit einer ersten und zweiten Basiseinheit

Publications (1)

Publication Number Publication Date
EP1096818A1 true EP1096818A1 (de) 2001-05-02

Family

ID=8239301

Family Applications (2)

Application Number Title Priority Date Filing Date
EP99121607A Withdrawn EP1096818A1 (de) 1999-10-29 1999-10-29 Basisstation mit einer ersten und zweiten Basiseinheit
EP00972807A Expired - Lifetime EP1243147B1 (de) 1999-10-29 2000-10-19 Basisstation mit einer ersten und zweiten basiseinheit

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP00972807A Expired - Lifetime EP1243147B1 (de) 1999-10-29 2000-10-19 Basisstation mit einer ersten und zweiten basiseinheit

Country Status (7)

Country Link
EP (2) EP1096818A1 (de)
JP (1) JP2003513569A (de)
CN (1) CN1169388C (de)
AT (1) ATE279080T1 (de)
AU (1) AU1140701A (de)
DE (1) DE60014705T2 (de)
WO (1) WO2001033876A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1330133A1 (de) * 2002-01-17 2003-07-23 Siemens Aktiengesellschaft Funkkommunikationssystem
EP1624589A1 (de) * 2004-08-03 2006-02-08 PROD-EL S.p.A. Vorrichtung und Verfahren für ein Funkkommunikationssystem mit analoger und digitaler Modulation
WO2015159316A1 (en) 2014-04-14 2015-10-22 Commscope Italy S.R.L. Same-band combiner for co-sited base stations

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10202141A1 (de) * 2002-01-21 2003-07-31 Tenovis Gmbh & Co Kg Accesspoint mit kombinierten Funkstandards
CN101771445B (zh) * 2003-04-23 2013-05-01 高通股份有限公司 增强无线通信***性能的方法和设备
US7120465B2 (en) * 2003-12-20 2006-10-10 Telefonaktiebolaget Lm Ericsson (Publ) Transceiver system including multiple radio base stations that share an antenna
CN1926716B (zh) 2004-03-11 2012-07-04 艾利森电话股份有限公司 天线分集***
ATE388533T1 (de) 2004-06-15 2008-03-15 Ericsson Telefon Ab L M Antennen-diversity-anordnung und -verfahren

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992012579A1 (en) * 1991-01-09 1992-07-23 Nokia Telecommunications Oy Radio transceiver system
WO1995006367A1 (en) * 1993-08-27 1995-03-02 Nokia Telecommunications Oy Base station equipment using diversity reception
US5969837A (en) * 1996-12-15 1999-10-19 Foxcom Wireless Ltd. Communications system

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI98332C (fi) * 1994-03-01 1997-05-26 Nokia Telecommunications Oy Tiedonsiirtomenetelmä, tukiasemalaitteisto sekä liikkuva asema
US5530921A (en) * 1995-02-09 1996-06-25 Telefonaktiebolaget Lm Ericsson Enhanced system and method for implementing a backup control channel in a cellular telecommunication network
SE505476C2 (sv) * 1996-06-12 1997-09-01 Ericsson Telefon Ab L M Anordning och förfarande vid signalöverföring
FI105511B (fi) * 1996-10-29 2000-08-31 Nokia Networks Oy Menetelmä usean signaalin yhdistämiseksi ja tukiasema
JP3177481B2 (ja) * 1997-05-27 2001-06-18 三洋電機株式会社 移動体通信システムの基地局
FI973849A (fi) * 1997-09-30 1999-03-31 Nokia Telecommunications Oy Menetelmä parantaa radioyhteyden laatua radiojärjestelmässä
FI107669B (fi) * 1998-02-13 2001-09-14 Nokia Mobile Phones Ltd Menetelmä ja järjestely tiedonsiirron salaamiseksi

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992012579A1 (en) * 1991-01-09 1992-07-23 Nokia Telecommunications Oy Radio transceiver system
WO1995006367A1 (en) * 1993-08-27 1995-03-02 Nokia Telecommunications Oy Base station equipment using diversity reception
US5969837A (en) * 1996-12-15 1999-10-19 Foxcom Wireless Ltd. Communications system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1330133A1 (de) * 2002-01-17 2003-07-23 Siemens Aktiengesellschaft Funkkommunikationssystem
WO2003061316A1 (de) * 2002-01-17 2003-07-24 Siemens Aktiengesellschaft Funkkommunikationssystem
US7092736B2 (en) 2002-01-17 2006-08-15 Siemens Aktiengesellschaft Radio communication system
EP1624589A1 (de) * 2004-08-03 2006-02-08 PROD-EL S.p.A. Vorrichtung und Verfahren für ein Funkkommunikationssystem mit analoger und digitaler Modulation
WO2015159316A1 (en) 2014-04-14 2015-10-22 Commscope Italy S.R.L. Same-band combiner for co-sited base stations

Also Published As

Publication number Publication date
ATE279080T1 (de) 2004-10-15
EP1243147A1 (de) 2002-09-25
DE60014705D1 (de) 2004-11-11
CN1385040A (zh) 2002-12-11
DE60014705T2 (de) 2005-10-13
AU1140701A (en) 2001-05-14
EP1243147B1 (de) 2004-10-06
CN1169388C (zh) 2004-09-29
JP2003513569A (ja) 2003-04-08
WO2001033876A1 (en) 2001-05-10

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